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To improve the barrier property of plastic
by：CSSSLD
2021-02-03
Barrier property of plastic are said plastic products for small molecular gas, liquid and vapor, fragrance and taste of shielding ability.
Used for characterization of the size of the plastic blocking ability index for the permeability coefficient.
Plastic and metal, glass and ceramic, compared to traditional packaging materials such as the ability to block is not high, which often limits its applications in some packaging.
Factors affecting injection molding products processing blocking ability with inner structure factors, there are external factors.
barrier property of different plastic materials is different, sensitive to temperature with barrier property of PVDC is more sensitive to temperature, and PA the barrier property of sensitivity to the temperature is very small. So although PA under greenhouse barrier property is not high, but basic don't drop the barrier property at high temperature. The influence of temperature on the barrier property of plastic tend to interfere with high temperature steam sterilization of packaging materials processing. The influence of the moisture barrier property of plastic effect than temperature. The barrier property of amorphous nylon slightly increased with the rise of temperature. Along with the rising of the container inside and outside differential pressure, speed the barrier property of the fall, for water vapor is the most plastic has excellent barrier property.
three very good barrier property of ethylene fluoride, its barrier property better than ceramic, even because of its excellent since the lip line, and sealing materials commonly used for vacuum system. General blending to improve the barrier property of plastic, this kind of blend of blending structure is one of continuity, another phase as the dispersed phase. Scattered often exist in island type structure. Laminar blending to improve the barrier property of plastic, this blend of blending for two phase continuous structure, namely the general resin as continuous phase, and barrier property resin as continuous phase. Laminar blending compared with general blending, is a more effective modification methods. For with the components of the blend, the barrier property of laminar blending than general blending the barrier property of more than ten times.
the type and dosage of compatilizer could also cambium-like dispersed key elements. Compatilizer the compatibilizing effect is better, tend to choose appropriate reactive compatibilizer. Only under the compatilizer is strong compatibilizers, two phase alloys was good stick relay, also fully stable layered structure.
interpenetrating networks refer to those two blend together in the form of network, one of the polymers by chemical bonds form into another kind of polymer. Because the interpenetrating network closely combined by chemical bonds between polymer molecules, molecular internal is very compact, thereby preventing the proliferation of small molecules, improve the barrier property.
the molding technological conditions is reasonable or not, is the key to can blend cambium-like structure conditions. Reasonably control the blend melt temperature, can make the viscosity of dispersed phase is greater than the viscosity of continuous phase, thus a cambium-like structure. Shear rate function has two aspects: on the one hand, the increase of shear rate can be decreased viscosity, control of two phase viscosity ratio; On the one hand, appropriately increasing the shear rate is advantageous to the layered shear and tensile deformation of the dispersed phase, cambium structure. Shear rate to the appropriate shear rate is too small, not enough to make the dispersed phase droplet deformation and orientation; Shear rate is too large, and the dispersed phase droplet could produce broken, form small uniform flow, generate unsteady turbulent flow.
injection processing cooling temperature is lower, the formation of the layered structure quickly finalize the design, in order to hold the layered structure. For extrusion molding, appropriately increasing the draw ratio, the formation of the proper stretching to melt forming sheet, favors the cambium-like decentralized structure.
more wonderful sharing: to add flame retardant plastic formula design, just click.
or copy the link: http://www. csssld。 cn//html/2016/Info_0626/272。 HTML
nantong on plastic products factory's official website: http://www. csssld。 cn//
barrier property of different plastic materials is different, sensitive to temperature with barrier property of PVDC is more sensitive to temperature, and PA the barrier property of sensitivity to the temperature is very small. So although PA under greenhouse barrier property is not high, but basic don't drop the barrier property at high temperature. The influence of temperature on the barrier property of plastic tend to interfere with high temperature steam sterilization of packaging materials processing. The influence of the moisture barrier property of plastic effect than temperature. The barrier property of amorphous nylon slightly increased with the rise of temperature. Along with the rising of the container inside and outside differential pressure, speed the barrier property of the fall, for water vapor is the most plastic has excellent barrier property.
three very good barrier property of ethylene fluoride, its barrier property better than ceramic, even because of its excellent since the lip line, and sealing materials commonly used for vacuum system. General blending to improve the barrier property of plastic, this kind of blend of blending structure is one of continuity, another phase as the dispersed phase. Scattered often exist in island type structure. Laminar blending to improve the barrier property of plastic, this blend of blending for two phase continuous structure, namely the general resin as continuous phase, and barrier property resin as continuous phase. Laminar blending compared with general blending, is a more effective modification methods. For with the components of the blend, the barrier property of laminar blending than general blending the barrier property of more than ten times.
the type and dosage of compatilizer could also cambium-like dispersed key elements. Compatilizer the compatibilizing effect is better, tend to choose appropriate reactive compatibilizer. Only under the compatilizer is strong compatibilizers, two phase alloys was good stick relay, also fully stable layered structure.
interpenetrating networks refer to those two blend together in the form of network, one of the polymers by chemical bonds form into another kind of polymer. Because the interpenetrating network closely combined by chemical bonds between polymer molecules, molecular internal is very compact, thereby preventing the proliferation of small molecules, improve the barrier property.
the molding technological conditions is reasonable or not, is the key to can blend cambium-like structure conditions. Reasonably control the blend melt temperature, can make the viscosity of dispersed phase is greater than the viscosity of continuous phase, thus a cambium-like structure. Shear rate function has two aspects: on the one hand, the increase of shear rate can be decreased viscosity, control of two phase viscosity ratio; On the one hand, appropriately increasing the shear rate is advantageous to the layered shear and tensile deformation of the dispersed phase, cambium structure. Shear rate to the appropriate shear rate is too small, not enough to make the dispersed phase droplet deformation and orientation; Shear rate is too large, and the dispersed phase droplet could produce broken, form small uniform flow, generate unsteady turbulent flow.
injection processing cooling temperature is lower, the formation of the layered structure quickly finalize the design, in order to hold the layered structure. For extrusion molding, appropriately increasing the draw ratio, the formation of the proper stretching to melt forming sheet, favors the cambium-like decentralized structure.
more wonderful sharing: to add flame retardant plastic formula design, just click.
or copy the link: http://www. csssld。 cn//html/2016/Info_0626/272。 HTML
nantong on plastic products factory's official website: http://www. csssld。 cn//
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